package org.hong.monkey.network.protocol;

import com.google.common.base.Objects;
import io.netty.buffer.ByteBuf;

public class StreamChunkId implements Encodable {
    public final long streamId;
    public final int chunkIndex;

    public StreamChunkId(long streamId, int chunkIndex) {
        this.streamId = streamId;
        this.chunkIndex = chunkIndex;
    }

    @Override
    public int encodedLength() {
        return 8 + 4;
    }

    public void encode(ByteBuf buffer) {
        buffer.writeLong(streamId);
        buffer.writeInt(chunkIndex);
    }

    public static StreamChunkId decode(ByteBuf buffer) {
        assert buffer.readableBytes() >= 8 + 4;
        long streamId = buffer.readLong();
        int chunkIndex = buffer.readInt();
        return new StreamChunkId(streamId, chunkIndex);
    }

    @Override
    public int hashCode() {
        return Objects.hashCode(streamId, chunkIndex);
    }

    @Override
    public boolean equals(Object other) {
        if (other instanceof StreamChunkId) {
            StreamChunkId o = (StreamChunkId) other;
            return streamId == o.streamId && chunkIndex == o.chunkIndex;
        }
        return false;
    }

    @Override
    public String toString() {
        return Objects.toStringHelper(this)
                .add("streamId", streamId)
                .add("chunkIndex", chunkIndex)
                .toString();
    }
}
